msxml3: nextsibling not support for Attribute, Document and Doc Frag Nodes

[Alistair Leslie-Hughes]

Hi,
	This patch replaces the last two.  It make the coding style more 
consistent with msxml.

Changelog:
	msxml3: nextsibling not support for Attribute, Document and Doc 
Fragment Nodes

Best Regards
  Alistair Leslie-Hughes
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